[CSteefel]

I had not heard that Rivendell was a staging ground. I do recall that Elendil watched for the arrival of Gilgalad from Weathertop, but that was a long way west.

In any case, we seem ample evidence that Gondor had lost track of most of what happened in the North Kingdom. Boromir did not know of the fate of Elendil's sword, or for that matter that his heirs still lived in that area. They also did not know that Isildur had kept the One Ring, and in fact much of what happened on the slopes of Mount Doom where only Isildur and Elendil on the one hand and Gilgalad and Elrond and Cirdan on the other were present, as Elrond clearly states in the Council of Elrond...